Saw-sharpening machine.



'J. BECKMAN.

SAW SHARPENING MACHINE. APPLICAHON FILED xuuszs, 1915.

1,173,920. Patented Feb.29,1 916.

- 3 S!-IEETS-SHEET I.

' 1. BECKMAN.

SAW SHARPENING MACHINE.

' APPLICATION FILED JUNE 29. 1915.

1,173,920 I PatentedFb. 29,1916.

7 3 SHEETS-SHEET 2.

J. BECKMAN.

SAW SHARPENINGMACHINE.

APLlCATION men JUNE 29, 1915.

Pat exited Feb. 29, 1916. Y

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565K BEGKMAN, OE YQSEBYJITIE, CAI-IFUIZNIA.

SAW-SHA'FEENEHg BETAGHINE.

Application filed June 29,

To all wit-0m may concern Be it known that 1, JOHN BnoKMeN, a citizen ofthe United States, residing at Yosemite, in the county of lliari posaand State of California have invented new and useful improvements inSaw-Sharpening Machines, of which the following is a specification.

This iriven- 'on relates to improvements in saw sharpening machines andhas particular application to a machine of the recipio eating file typeIn carrying out the present invention is my purpose to improve and simp.fy the general Construction of sharpening chines of the reciprocating"file type and to provide a machiiie wherein the carriage carryin thewill be automatically ad vaiiced in a s by manner during the ration andto insure the all the teeth of the saw and wherein the will bereciprooated over each tooth of thesaw a certain number of timesprevious to the movement of the car- I riage thereby enabling the saw toeffectively sharpened,

It is also my purpose to provide a sharpening machine of the classdescribed wherein the tiling mechanism may be turned to any desired tocorrespond with the angle of the saw teeth so as to insure the propersharpening of the teeth, and wherein the component parts will be soarranged and correlated to reduce the possibility of derangenientto aminimum.

"With the above and other objects in View the invention consists in theconstri'iction, combination and arrangement of parts here inafter setforth in and falling within the scope of the claims. I v

In the accompanying drawings: Figure lis a top plan view of a sawsharpening; ma chine constructed in accordance with the presentinvention. Fig.2 is a viewin front letters ?atehted Feb. 239* El iot1915. Serial Ho. 37,013.

in parallelism, while 2, 2 indicate guide tracks secured to the upperends of the legs 1, l and spanning the space between such legs andarranged parallel with each other.

3 designates a carriage comprising end plates l, 4- each having thelower edge thereor formed with grooves 5, 5 spaced apart and alininrespectively with the grooves in the bottom ofthe other plate and thesealining; grooves receive the tracks 2, 2 respectively so that thecarriage may be held upon. the tracks and moved longitudinally there--along, The end plates 4, 4e are held spaced parallel relation and incarriage formotion by means of tie rods appropriately arranged, whileformed in the end plates 4, ectively are vertical saw receiving slots 3'a hing; with each other; Disposed be tween the plates 1-, a is a sawclamp embodying' a strip 8 having the ends thereof secured to the innersurfaces of the respective plates e upon one side of the slots '2', andthe strip 9 having the ends thereof secured to the inner surfaces ofsuch end plates and disposed at the opposite side of the slots 7 andpaced apart from the strip-8 in parallelisin therewith. These strips 8and and. the slots 7 cooperate to receive the saw to be sharpened asillustrated in Fig. 3 of the drawings, and when the saw is disposed inthe clamp the toothed edge thereof projects upwardly above the strips 8and 9. In the present instance the strip 9 is equipped with set screwsl0whereby the saw may be fastoned within the clamp and held thereinagainst movement.

i ll designates a rack bar disposed. between the end plates 4, iadjacent to one side of v the carriage and the ends of the rack bar 11are formed with axially alining sockets that receive similarly arrangedpins 12 carried by the inner faces of the respective end plates 4-,-

The lower surface of the rack bar 11. is equipped with the teeth whilethe therefrom is a platform 15 disposed in ad.- vance of the front sideof the carriage and pivoted cehtrally upon the platform 15 is a turntable 16 capable of turning movement upon the platform. The front edgesof the platform and turn table are curved and for' ined in the edge ofthe platform are slots 17, while pivoted upon the turntable is a holdingarm 18 equipped with a depending pin 19 adapted to pass through anopening in the turn table to engage in an alined slot 17 to hold theturn table against turning movement upon the platspur pinion23 meshing"witl a similar pinion 24* rotatably mounted upon a stub shaft 25 carriedby the inner standard 20. The pinion 2d'meshes with a pinion 26 keyedupon the power transmission shaft 22 so that in the rotation of thedrive shaft motion will be transmitted through the pinions 23, 24' and26 to the shaft 22,'thereby rotating the latter. Also keyed upon thedrive shaft 21 between the standards is a spur pinion 27 meshing with acrown gear, 28 journaled upon a stub shaft 29 carried by the upper endof a standard 30 mounted upon the turn table between the standards 21.

31, 31 designate uprights fastened to the turn table at one side of thepower transmission shaft 22 and adjacent to the crown gear 28and-secured to the upper ends of the uprights 31, 31 are guides 32, 32respectively spaced apart in parallelism and hav- -with longitudinalgrooves 33.

mg the confronting faces thereof formed Mounted within the grooves 33and capable of rectilinear motion' therein is a head 34. In the presentinstance, this head is in the form of a rectangular frame and pivtotallyconnected with one'end' bar of'the frame forming the head 34 is afile35, while pivotally connected with the remaining end bar of the headforming the frame is one extremity of a pitman 36 and the remaining endof the pitman 36 is connected with a'crank pin 37 secured to the outers'urfaceof the crown gear 28 adjacent to the periphery of such gear. Therear end of the transmission shaft 22, that is the end adjacent to therack bar 11, is connected through the 1nedium of a universal joint 38with a shaft sec tion 39 journaled in a bearing 40 carried by invaoaothe rear edge of the turntable and the universal joint 38 is disposed inline'with the pivot of the turn table 16. Keyed upon the shaft section39 is a disk 41 having'the periphery thereof provided with a radial pin42 adapted to engage the rack bar 11 to advance the carriage along theguide tracks In practice, the rack bar is disposed in normal positionand held in such position by the latches and the turn table rotated uponthe platform to dispose the file 35 at an angle corresponding to theangle of the teeth of the saw in the clamp and the,

turn table locked in adjusted position.

vPower is now imparted to the drive shaft 21 and in the rotation of thedrive-shaft 21 thecrown gear is revolved and reciprocates.

the head 34in the grooves 33 of the guides 32, thereby impartingrectilinear motion to the file so as to move thelatter over the adjacenttooth of the saw to sharpen such tooth. In the rotation'of the driveshaft 21 motion is imparted to the transmission shaft 22 and the latterrevolves the shaft section '39 and after the file has mad apertainnumber of movements, determined by the ratio of the gears between thedrive shaft and the power transmission shaft, the pin 42 carried by thedisk 41 engages the adjacent tooth of the rack bar 11 and moves thecarriage along'the guide tracks a distance equal to the distance of onesaw tooth and in this movement of the carriage the file rides out of thepreviously sharpened tooth and into engagement with the next tooth, thefile swinging about its pivotal I connection with the head to disengageand engage the adjacent teeth of the saw in the clamp. v

While I have herein shown and described one preferred form of myinvention by way of illustration, I wish it to be understood that-1' donot limit or confine myself to the precise details of constructionherein described and delineated, as modification and variation may bemade within the scope of the claims without departing from the spirit ofthe invention.

I claim:

1. In a saw sharpening machine, supporting legs spaced apart inparallelism, guide tracks secured to the upper ends of said legs andspanning the space between the same and disposed parallel with eachother, a carriage embodying end plates each having the lower edgethereof formed with grooves spaced apart and alining respectively withthe grooves in the bottom edges of the other plate to receive saidtracks, tie rods holding said side plates in proper relative positions,a'saw clamp on. said carriage, and filing mechanism for sharpening theteeth of the saw in said clamp.

2. In a saw sharpening machine, supporting legs spaced apart inparallelism, guide tracksseoure i to the upper enfis of said legsamlspanning-the space between the of 'the other plate to receive saidtracks, tie rods holdlng said side plates in proper relaw tivepositions, a saNy clamp on said carriage a platform carried by saidlegs, a turn table mountednpon said platform, and saw filing mechanism.carried by said turn table to sharpen theteeth of the saw in saidc1amp.. I

In testimony whereof I aflixjmy signature 15 in presence of-twowitnesses. JOHN BEGKMAN.

Witnesses: V ARTHUR YOUNG, JAs. DE BA LI.

